Selective omission of sentinel lymph node biopsy in mastectomy for ductal carcinoma in situ: identifying eligible candidates

Table 1 Baseline characteristics

Variables		Total (n = 385)
Variables		N	(%)
Preoperative factors	Age (years)
	≤ 50	220	57.1
	> 50	165	42.9
	Clinical tumor size, median (range), cm	4.5 (0.5–12.9)
	≤ 2 cm	60	15.6
	2 –5 cm	172	44.7
	> 5 cm	153	39.7
	Palpable mass or bloody nipple discharge
	No	217	56.4
	Yes	168	43.6
	Suspicious axillary lymph node on radiologic evaluation
	No	296	76.9
	Yes	89	23.1
	Suspicious microcalcification on radiologic evaluation
	No	119	30.9
	Yes	266	69.1
	Nuclear grade^*,†
	Low	53	16.4
	Intermediate	184	57
	High	86	26.6
	Comedo necrosis^*,†
	No	111	36.4
	Yes	194	63.6
Postoperative factors	Pathologic DCIS size, median (range), cm	4.15 (0.1–20)
	Nuclear grade^‡
	Low	28	7.3
	Intermediate	219	56.9
	High	138	35.8
	Comedo necrosis^*,‡
	No	91	23.9
	Yes	290	76.1
	Hormone receptor ^*,‡
	Negative	99	25.7
	Positive	282	73.2
	HER2^*,‡
	Negative	254	66.0
	Positive	127	33.0
	Ki-67 (%)^{*, ‡}
	< 14	274	72.1
	≥ 14	106	27.9

^*Missing values
^†Values assessed in biopsy specimens
^‡Values assessed in surgical specimens
DCIS = ductal carcinoma in situ, HR = hormone receptor, HER2 = human epidermal growth factor receptor 2

ISSN: 1465-542X